docs: def get_nmr_prize_pool(self, round_num=0, tournament=1):
          """Get NMR prize pool for the given round and tournament.
  
          Args:
              round_num (int, optional): The round you are interested in,
                  defaults to current round.
              tournament (int, optional): ID of the tournament, defaults to 1
  
          Returns:
              decimal.Decimal: prize pool in NMR
  
          Raises:
              Value Error: in case of invalid round number
          """
          tournaments = self.get_competitions(tournament)
          tournaments.sort(key=lambda t: t['number'])
          if round_num == 0:
              t = tournaments[-1]
          else:
              tournaments = [t for t in tournaments if t['number'] == round_num]
              if len(tournaments) == 0:
                  raise ValueError("invalid round number")
              t = tournaments[0]
          return t['prizePoolNmr']